Note 9 - Stock-based Compensation (Tables)

12 Months Ended

Sep. 28, 2019

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Year Ended
	Septem ber 28 ,			Septem ber 29 ,			Septem ber 30 ,
	201 9			201 8			201 7
Expected term (in years)		4.59			4.79			5.14
Risk-free interest rate		2.03	%		2.71	%		1.98	%
Expected volatility		42.79	%		37.32	%		38.32	%
Expected dividend yield		0.56	%		0.37	%		0.37	%

Share-based Payment Arrangement, Option, Activity [Table Text Block]

										Contractual
				Exercise Price						Term -	Aggregate
				Per Share						Weighted	Intrinsic
	Options							Weighted		Average	Value
(Share amounts in thousands)	Outstanding			Range				Average		(in years)	(in thousands)
Outstanding at October 1, 2016		371			$9.16	-	$34.49	$	20.81
Granted		88			26.75	-	37.06		30.93
Exercised		(67	)		9.16	-	23.95		19.05		$	1,212
Outstanding at September 30, 2017		392			9.16	-	37.06		23.40
Granted		77			29.69	-	41.85		34.84
Exercised		(196	)		9.16	-	37.06		19.68			3,866
Forfeited		(9	)		23.95	-	37.06		29.88
Outstanding at September 29, 2018		264			10.23	-	41.85		29.25
Granted		129			18.25	-	21.57		19.74
Exercised		(5	)		18.05	-	26.75		23.95			21
Outstanding at September 28, 2019		388			10.23	-	41.85		26.16	7.81		370
Vested and anticipated to vest in the future at September 28, 2019		384							26.17	7.79		366
Exercisable at September 28, 2019		184							27.62	6.31		195

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

				Weighted
	Restricted			Average
	Stock Units			Grant Date
(Unit amounts in thousands)	Outstanding			Fair Value
Balance, October 1, 2016		145		$	22.35
Granted		37			31.95
Released		(54	)		20.43
Balance, September 30, 2017		128			25.92
Granted		35			33.52
Forfeited		(3	)		29.60
Released		(57	)		22.26
Balance, September 29, 2018		103			30.40
Granted		61			20.18
Released		(49	)		27.64
Balance, September 28, 2019		115			26.16

Restricted Stock Units (RSUs) [Member]

Notes Tables

Share-based Payment Arrangement, Cost by Plan [Table Text Block]

	Year Ended
	September 28,		September 29,		September 30,
(In thousands)	2019		2018		2017
Restricted stock unit grants:
Units		61		35		37
Market value	$	1,225	$	1,175	$	1,180
Compensation expense		1,168		1,172		1,238